fox news alert. we're waiting for a news conference any moment now upstate new york. a gunman has opened fire at four firefighters that came to battle a blaze that may have been a trap set by the shooter. listen to some of the emergency radio calls being placed as crews realized exactly what was happening. >> we're being shot at. multiple firemen done. multiple firemen shot. i am shot. i think he is using an assault rifle. we have multiple firemen down. working fire. shot with a firearm. >> understood. what is your 32, copy, multiple firemen down, multiple firemen shot with a working fire. gregg: let's pick up the story with david lee miller live in our new york newsroom. david? >> reporter: gregg, the questions at this hour remain unanswered, who was the shooter and what was his motive? this is what we do know. it was about 5:35 when the west webster firefighters responded to a house fire. there you see the blaze. two of the firefighters shot and killed at the scene. two others seriously wounded. a police officer off-duty from a nearby police department was also woun